1 files changed, 7 insertions, 49 deletions

diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index 786c0fae6e30..896b4bf05b9c 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -2977,13 +2977,6 @@ void mem_cgroup_commit_charge(struct folio *folio, struct mem_cgroup *memcg)
 }
 
 #ifdef CONFIG_MEMCG_KMEM
-/*
- * The allocated objcg pointers array is not accounted directly.
- * Moreover, it should not come from DMA buffer and is not readily
- * reclaimable. So those GFP bits should be masked off.
- */
-#define OBJCGS_CLEAR_MASK	(__GFP_DMA | __GFP_RECLAIMABLE | \
-				 __GFP_ACCOUNT | __GFP_NOFAIL)
 
 /*
  * mod_objcg_mlstate() may be called with irq enabled, so
@@ -3003,62 +2996,27 @@ static inline void mod_objcg_mlstate(struct obj_cgroup *objcg,
 	rcu_read_unlock();
 }
 
-int memcg_alloc_slab_cgroups(struct slab *slab, struct kmem_cache *s,
-				 gfp_t gfp, bool new_slab)
-{
-	unsigned int objects = objs_per_slab(s, slab);
-	unsigned long memcg_data;
-	void *vec;
-
-	gfp &= ~OBJCGS_CLEAR_MASK;
-	vec = kcalloc_node(objects, sizeof(struct obj_cgroup *), gfp,
-			   slab_nid(slab));
-	if (!vec)
-		return -ENOMEM;
-
-	memcg_data = (unsigned long) vec | MEMCG_DATA_OBJCGS;
-	if (new_slab) {
-		/*
-		 * If the slab is brand new and nobody can yet access its
-		 * memcg_data, no synchronization is required and memcg_data can
-		 * be simply assigned.
-		 */
-		slab->memcg_data = memcg_data;
-	} else if (cmpxchg(&slab->memcg_data, 0, memcg_data)) {
-		/*
-		 * If the slab is already in use, somebody can allocate and
-		 * assign obj_cgroups in parallel. In this case the existing
-		 * objcg vector should be reused.
-		 */
-		kfree(vec);
-		return 0;
-	}
-
-	kmemleak_not_leak(vec);
-	return 0;
-}
-
 static __always_inline
 struct mem_cgroup *mem_cgroup_from_obj_folio(struct folio *folio, void *p)
 {
 	/*
 	 * Slab objects are accounted individually, not per-page.
 	 * Memcg membership data for each individual object is saved in
-	 * slab->memcg_data.
+	 * slab->obj_exts.
 	 */
 	if (folio_test_slab(folio)) {
-		struct obj_cgroup **objcgs;
+		struct slabobj_ext *obj_exts;
 		struct slab *slab;
 		unsigned int off;
 
 		slab = folio_slab(folio);
-		objcgs = slab_objcgs(slab);
-		if (!objcgs)
+		obj_exts = slab_obj_exts(slab);
+		if (!obj_exts)
 			return NULL;
 
 		off = obj_to_index(slab->slab_cache, slab, p);
-		if (objcgs[off])
-			return obj_cgroup_memcg(objcgs[off]);
+		if (obj_exts[off].objcg)
+			return obj_cgroup_memcg(obj_exts[off].objcg);
 
 		return NULL;
 	}
@@ -3066,7 +3024,7 @@ struct mem_cgroup *mem_cgroup_from_obj_folio(struct folio *folio, void *p)
 	/*
 	 * folio_memcg_check() is used here, because in theory we can encounter
 	 * a folio where the slab flag has been cleared already, but
-	 * slab->memcg_data has not been freed yet
+	 * slab->obj_exts has not been freed yet
 	 * folio_memcg_check() will guarantee that a proper memory
 	 * cgroup pointer or NULL will be returned.
 	 */